Inheritance Patterns Quiz - CBSE Class 12 Biology

Free practice quiz: Inheritance Patterns (CBSE Class 12 Biology). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 12 Biology practice quiz has 20 multiple-choice questions on Inheritance Patterns, and 20 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. What is the basic unit of heredity?

   1. Chromosome
   2. Gene
   3. DNA
   4. RNA
   Show answer

   Answer: B. Gene

   A gene is the basic unit of heredity that carries the information for a specific trait.

2. Which of the following can influence the expression of a trait?

   1. Environment
   2. Genotype
   3. Genetics
   4. All of the above
   Show answer

   Answer: D. All of the above

   All these factors influence the expression of a trait, as they interact to determine phenotype.

3. Which phenomenon can disrupt Mendelian inheritance?

   1. Linkage
   2. Independent assortment
   3. Segregation
   4. Dominant traits
   Show answer

   Answer: A. Linkage

   Linkage refers to genes located close together on a chromosome, which can lead to deviations from Mendelian inheritance predictions.

4. How can mutations affect inheritance patterns?

   1. They have no impact
   2. They can create new alleles
   3. They always cause disease
   4. They only affect dominant traits
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   Answer: B. They can create new alleles

   Mutations can lead to the emergence of new alleles in a population, thereby altering inheritance patterns over generations.

5. How can studying genetics help in agriculture?

   1. Improving yield
   2. Understanding soil composition
   3. Enhancing crop resistance
   4. Both improving yield and enhancing resistance
   Show answer

   Answer: D. Both improving yield and enhancing resistance

   Genetic studies can lead to both improved yields and enhanced resistance in crops, benefiting agricultural practices.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which of the following describes a phenotype?
2. What do homozygous alleles refer to?
3. In which type of inheritance do both alleles contribute to the phenotype?
4. What is the probability of obtaining a homozygous recessive offspring from a cross between two heterozygous parents (Aa x Aa)?
5. What represents a recessive trait in a pedigree chart?
6. What is an example of a sex-linked trait?
7. In a dihybrid cross, what ratio is expected in the F2 generation?
8. What is the significance of the Punnett square?
9. Which of the following principles states that alleles segregate during gamete formation?
10. What does incomplete dominance result in?
11. What happens during non-disjunction in meiosis?
12. How does a carrier for a sex-linked trait differ from an affected individual?
13. What is the role of telomeres in genetic inheritance?
14. What is an autosomal recessive disorder?
15. What defines polygenic inheritance?

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